Controlling extruder output rate - by heating or cooling grooved infeed section with decreasing or increasing output rate

摘要

Output and/or quality of an extruder having a grooved section adjacent the feed opening is/are controlled by cooling or heating the grooved section (12) with progressively increasing or decreasing output rate. Pref. the grooved section is provided with a temp. controlling thermocouple which is effective to induce the heating of the plasticised material when a transition from high output to low output, i.e. redn. of extruder worm screw speed takes place, is signalled. Cooling takes place when the opposite condition is established.